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Lamprey Metamorphosis

  • Richard G. ManzonEmail author
  • John H. Youson
  • John A. Holmes
Chapter
Part of the Fish & Fisheries Series book series (FIFI, volume 37)

Abstract

Among vertebrates, true metamorphosis is restricted to amphibians, two groups of bony fishes, and lampreys. This chapter provides a comprehensive review of the ecology, morphology, physiology, and molecular biology of lamprey metamorphosis. The lamprey life cycle includes an embryonic period, a larval period ending with metamorphosis, a parasitic or non-parasitic juvenile period, and an adult reproductive period. Lamprey metamorphosis is influenced by endogenous and exogenous factors, most significantly a rise in spring water temperature, the accumulation of sufficient lipid reserves for the non-trophic metamorphic phase, and thyroid hormones. In lampreys, thyroid hormones appear to have a dual role, whereby high levels promote larval growth and a subsequent sharp decline is important for development and metamorphosis. As with other true metamorphoses, dramatic biochemical, cellular, and morphological changes occur during lamprey metamorphosis. The external changes are striking and include the development of an oral (suctorial) disc and eyes, restructuring of the branchial region, and changes in the fins and body coloration. Internal changes include major modifications to the digestive system (new esophagus, remodeled intestine, and loss of hepatic biliary tree and gall bladder). The larval kidneys regress while the definitive juvenile kidney develops de novo. Numerous changes are also observed in the respiratory and skeletal systems in preparation for the juvenile and spawning periods.

Keywords

Condition factor Hypothalamic-pituitary Life history Lipid Metamorphosis Temperature Thyroid hormones 

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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Richard G. Manzon
    • 1
    Email author
  • John H. Youson
    • 2
  • John A. Holmes
    • 3
  1. 1.Department of BiologyUniversity of ReginaReginaCanada
  2. 2.Department of Biological SciencesUniversity of TorontoTorontoCanada
  3. 3.Fisheries and Oceans Canada, Pacific Biological StationNanaimoCanada

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